β-catenin mediates endodermal commitment of human ES cells via distinct transactivation functions nork Xun Ma, Liujiang Dai, Chunlai Tan, Jiangchuan Li, Xiangjun He, Yaofeng Wang, Junyi Xue, Min Huang, Jianwei Ren, Yin Xia, Qiang Wu, Hui Zhao, Wai-Yee Chan, Bo Feng

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